Montana vs Idaho: Vehicle Registration Cost Comparison
Comparing what the same vehicles cost to register each year in Montana versus Idaho, computed from both states' current official fee schedules:
| Scenario | Montana | Idaho |
|---|---|---|
| New $45k gas SUV | $217.00/yr | $77.00/yr |
| 3-yr-old $35k gas car | $217.00/yr | $65.00/yr |
| New $55k EV | $347.00/yr | $217.00/yr |
| 10-yr-old $8k car | $87.00/yr | $53.00/yr |
For most vehicles, Idaho is the cheaper state to register in — though the gap varies a lot by vehicle value and age. Keep in mind annual registration is only part of the picture: sales/excise taxes at purchase, insurance, and local property taxes on vehicles can outweigh the registration difference.
Montana in short
Montana registration is purely age-based: $217 per year for vehicles 0–4 years old, $87 for 5–10, and $28 at 11+ — when permanent registration (one-time, ~$87.50 plus county option tax) becomes available and most owners take it. Luxury vehicles with MSRP over $150,000 add an $825 annual surcharge. EVs pay $130 and plug-in hybrids $70. No sales tax — hence all the exotic cars with Montana plates.
Idaho in short
Idaho registration is simple and age-based: $69 per year for vehicles 1–2 years old, $57 for years 3–6, and $45 from year 7 on, plus county administrative fees of $3–$14. EVs add $140 and plug-in hybrids $75.
All figures computed from official fee schedules — sources: https://www.yellowstonecountymt.gov/Treasurer/MotorV/schedules.asp — last reviewed 2026-07-16.